Relativity
What is the difference between Real and Relativistic mass??? An important topic for Einstein's relativity!!! Ultimate simplification!!!
Throughout our high school days, whenever there is a
theory in which we use mass, we always studied rest mass. But how there is two
kind of masses. To understand this firstly we have to understand what is mass
according to classical physics.
Mass is both a property of a physical body and
a measure of
its resistance to acceleration (a change in its state of motion)
when a net force is
applied.
Okay
till here everything is fine!!!
This
definition of mass will be applicable to our normal world. But when we are discussing
the topics like relativity and dealing with a velocity which is comparable with
velocity of light, this ‘rest mass’ concept fails there.
Rest mass is the Newtonian mass as measured by an
observer moving along with the object. Rest mass is the portion of the
total mass of an object or system of
objects that is independent of the overall motion of the system. More
precisely, it is a characteristic of the system's total energy and momentum that
is the same in all frames of reference related by Lorentz transformations. If
a center-of-momentum frame exists
for the system, then the invariant mass of a system is equal to its total mass
in that "rest frame".
But relativistic mass is the mass used in theory of
relativity. Relativistic mass is the total quantity
of energy in a body or system divided by c2. The
word mass is given two meanings in special relativity: one
(rest or invariant mass, and its equivalent rest energy) is an
invariant quantity which is the same for all observers in all reference frames;
the other (relativistic mass or the equivalent total energy of
the body) is dependent on the velocity of the observer.
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-Ratnadeep Das Choudhury
Founder and writer of The Dynamic Frequency
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